Android Open Source - Common-Library Location Manager

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License

The source code is released under:
Apache License
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Java Source Code

package com.morgan.library.service;
//from w  ww .  jav  a2s  . c om
import java.util.ArrayList;
import java.util.List;

import com.baidu.location.BDLocation;
import com.baidu.location.BDLocationListener;
import com.baidu.location.LocationClient;
import com.baidu.location.LocationClientOption;
import com.morgan.library.R;
import com.morgan.library.app.APPContext;

/**
 * ???????????????????????????????{@link #getLastLocation()}????????????????.
 * 
 * @author Morgan.Ji
 * 
 */
public class LocationManager {

  public static final double NO_LOCATION = 4.9E-324;
  private static LocationManager instance;
  private LocationClient mLocClient;
  private static final int minTime = 10 * 1000;
  private List<LocationCallBack> mCallback;
  private BDLocationListener mBDLocationListener;
  private BDLocation mLastLocation;

  private LocationManager() {
    mLocClient = new LocationClient(APPContext.getContext());
    mLastLocation = mLocClient.getLastKnownLocation();
    mCallback = new ArrayList<LocationCallBack>();
    setLocationOption();
    registerLocationListener();
  }

  private void setLocationOption() {
    LocationClientOption option = new LocationClientOption();
    // ??gps
    option.setOpenGps(true);
    option.setPriority(LocationClientOption.GpsFirst);
    // ????????
    option.setCoorType("bd09ll");
    option.setAddrType("All");
    option.setScanSpan(minTime);
    option.setProdName(APPContext.getContext().getString(R.string.app_name));
    option.disableCache(true);
    mLocClient.setLocOption(option);
  }

  public static LocationManager getInstance() {
    if (instance == null) {
      instance = new LocationManager();
    }
    return instance;
  }

  private void startLocClient() {
    if (mLocClient != null && !mLocClient.isStarted()) {
      mLocClient.start();
    }
  }

  private void requestLocation() {
    if (mLocClient != null && !mLocClient.isStarted()) {
      mLocClient.requestLocation();
    }
  }

  private void stopLocClient() {
    if (mLocClient != null) {
      mLocClient.stop();
    }
  }

  public BDLocation getLastLocation() {
    return mLastLocation;
  }

  private void registerLocationListener() {
    if (mBDLocationListener == null) {
      mBDLocationListener = new MyLocationListenner();
      mLocClient.registerLocationListener(mBDLocationListener);
    }
  }

  public void destoryLocationListener() {
    mLocClient.unRegisterLocationListener(mBDLocationListener);
    mBDLocationListener = null;
  }

  public void startLocate(LocationCallBack callback) {
    if (!mCallback.contains(callback)) {
      this.mCallback.add(callback);
    }
    startLocClient();
  }

  public void removeCallback(LocationCallBack callback) {
    this.mCallback.remove(callback);
    if (mCallback.size() == 0) {
      stopLocClient();
    }
  }

  public class MyLocationListenner implements BDLocationListener {
    @Override
    public void onReceiveLocation(BDLocation location) {
      if (location == null || location.getLatitude() == NO_LOCATION) {
        for (int i = mCallback.size() - 1; i >= 0; i--) {
          mCallback.get(i).onNoLocation();
        }
        if (mCallback.size() > 0) {
          requestLocation();
        }
      } else {
        updateLocation(location);
      }
    }

    public void onReceivePoi(BDLocation poiLocation) {
      if (poiLocation == null) {
        return;
      }
    }
  }

  private void updateLocation(BDLocation location) {
    if (location.getAltitude() < 0 || location.getAltitude() == NO_LOCATION) {
      location.setAltitude(0);
    }
    for (int i = mCallback.size() - 1; i >= 0; i--) {
      mCallback.get(i).onReceiveLocation(location);
    }
    mLastLocation = location;
  }

  public interface LocationCallBack {
    /**
     * ??????
     * 
     * @param location
     */
    void onReceiveLocation(BDLocation location);

    /**
     * ???????????
     */
    void onNoLocation();
  }
}
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